can someone go over the Pontiac Ram Air systems in a quick rundown?

Ram Air I would be the original RamAir which was just known as RamAir. RamAir II was the 1st round port RamAir engine and was the precursor to the RamAir IV. RamAir III was basically an updated RamAir I engine and was much more common than the RamAir IV. Ram Air IV was sold at the same time as the RamAir III and was an engine designed with racing in mind. The RAIV was very underrated at 370 horsepower. Back in the day, NHRA rated it at 425 horsepower.